16665444427 has 8 divisors (see below), whose sum is σ = 17009536320. Its totient is φ = 16323639360.

The previous prime is 16665444401. The next prime is 16665444431. The reversal of 16665444427 is 72444456661.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16665444427 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16665444457) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 556978 + ... + 586135.

It is an arithmetic number, because the mean of its divisors is an integer number (2126192040).

Almost surely, 2^16665444427 is an apocalyptic number.

16665444427 is a deficient number, since it is larger than the sum of its proper divisors (344091893).

16665444427 is a wasteful number, since it uses less digits than its factorization.

16665444427 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1143413.

The product of its digits is 3870720, while the sum is 49.

The spelling of 16665444427 in words is "sixteen billion, six hundred sixty-five million, four hundred forty-four thousand, four hundred twenty-seven".